Yilong HAN 韓一龍
Associate Professor, Department of Physics
Office: Room 4447 (temporarily moved to room 3430),
Tel: (852) 2358-7492
Lab: Room 4141, Tel: (852) 2358-7524
Fax: (852) 2358 1652
Associate Professor (2013 - present)
Postdoc 2004 - 2007 University of Pennsylvania, USA
Ph.D. 1998 - 2003 University of Chicago, USA
B.S. 1994 - 1998 Peking University (Beijing University), China
1. Experimental soft condensed matter physics
We investigate the microscopic structures, interactions, dynamics, pattern formation and phase behaviors of colloids such as micro-ellipsoids and diameter-tunable microgel spheres. Colloids are good model systems of atoms because trajectories of individual particles are measurable by video microscopy and image processing. Currently we are focusing on the melting, freezing, solid-solid transitions, glass transitions and geometrical frustrations of colloids in two dimensions, three dimensions and thin films.
2. Statistical physics
We apply the complex-network analysis to phase-space studies and discovered that the phase spaces of frustration spin models, lattice gases and spin glasses share some common features. They established a new class of network with unique topology. A math by-product is a one-to-one mapping between 2D jigsaw-puzzle tiling and 3D stack of spheres. We are also interested in configurational temperatures and Brownian motions.
Modes of surface premelting in attractive colloidal crystals, Bo Li, Feng Wang, Di Zhou, Yi Peng, Ran Ni, and Yilong Han*, Nature, 531, 485 (2016).
Assembly and phase transitions within colloidal crystals, Bo Li, Di Zhou and Yilong Han*, Nature Reviews Materials, 1, 15011 (2016) (cover article) arxiv:1603.05021
Direct observation of liquid nucleus growth in homogeneous melting of colloidal crystals, Ziren Wang, Feng Wang, Yi Peng, and Yilong Han*, Nature Communications, 6, 6942 (2015)
Two-step nucleation mechanisms in solid-solid phase transitions, Yi Peng, Feng Wang, Ziren Wang, Ahemd Alsayed, Zexin Zhang, Arjun Yodh and Yilong Han*, Nature Materials, 14, 101–108 (2015) (cover article)
Structural signatures of dynamic heterogeneities in monolayers of colloidal
ellipsoids, Zhongyu Zheng*, Ran Ni, Feng Wang, Marjolein Dijkstra, Yuren
Wang and Yilong Han*, Nature Communications,
5, 3829 (2014)